Wrist pin tool



Oct 7,

WRIST PIN TOOL Filed Deo. l, 1939 2 sheets-sheet 2 www @m Patented Oct. 7, 1941 FICE,

. vvaIsT PIN 'rooLv J ackCaldWell, Havre, Mont.v Application December 1, 1939, Serial No. 307,155

14 Claim.

This invention relates tov a wrist pin tool, and has for the primary object the provision of an eflicient and inexpensive hand device of this character which will` permit a person to easily and quickly place a wrist pin in a piston and connecting rod and to align the lock bolt opening of the wrist pin with the lock bolt openingof the piston and to thread the lock bolt into said openings with the device still in position within thewrist pin thereby saving a large amount of time in the application of the wrist pin in the piston and connecting rod. l Y

`With these and other objectsl in` view, the inventionconsists in certain novel features of construction, combination and arrangement of parts to be Ahereinafter more fully,` described and claimed.

For a complete understanding of my invention.

reference is to behad to the following description and accompanying drawings, in which Figure 1 is afragmentary vertical sectional view illustrating a portion of a piston and connecting rod having a wrist pin applied thereto through the use of the present invention.

Figure 2 is a View similar to Figure l showing the tool equipped with a sleeve for the purpose of adapting said tool to a wrist pin of a larger size than that shown in Figure 1.

Figure 3 is a vertical sectional View illustrating thetool.

Figure 4 is a perspective View illustrating the body of the tool.

Figure 5 is a perspective view illustrating an adjusting shaft of the tool.

Figure 6 is a perspective View illustrating one of the sleeves which may be provided for use in connection with this tool for adapting the latter to wrist pins of a larger size.

Figure 7 is a perspective View illustrating the centering pin.

Figure 8 is a transverse sectional view taken on the line 8-8 of Figure 3.

Figure 9 is a fragmentary sectional view showing the tool inserted in a portion of a piston with a wrist pin adapted thereto prior to aligning the opening of the wrist pin with the bolt opening of the piston.

Figure 10 is a detail elevational view showing a portion of a wrench applied to one end of the tool.

Referring in detail to the drawings, the numeral 5 indicates a fragmentary portion of a piston, 6 one of the wrist pin bearing portions of the piston and which is provided with a screw threaded locking bolt opening 1. 8 indicates a fragmentary portion of a connecting rod and I0 a 55 ing I8 of the portion of a wrist pin, the latter having an opening which when properly applied `to the piston and connecting rod must align withthe opening Ii ,in order that the usual lock bolt may be threaded into the piston so as to extend into the piston pin s for locking the latter in place in the bearing 6 of the piston. It is a very diiicult matter to bring about the aligning of said openings without the aid ofa special tool, otherwise considerable timeis lost in the proper installing of a piston pin. To save time and render the application of wrist pins to pistons comparatively easy and quick thepresent invention may be employed. Y

An elongated cylindricalbody II has one end portion provided with flattened faces I2 tobe engaged by a wrench I3 or similar tool. The

body II has a bore I4 extending from end to end thereof and arranged eccentrically of thegaxis of said bodyfor the purpose of slidably receiving an adjusting shaft I5. The body VII within its non-reduced end is provided. with ,.a lscrew threaded opening I6 to receive a set bolt I'I. The body is further provided with an opening I8 which opens outwardly throughone side of the body and communicates with the bore and the` screw threaded opening to slidably receive an aligningpin I9, one end of which is beveled, as shown at 20. The pin I9 is further provided with a flattened face 2I defining at each end thereof shoulders 22. The set bolt II is adapted to engage the flattened face 2| of the aligning pin and prevents said aligning pin from turning in the opening I'8 but which will permit the aligning pin to slide freely in the opening for a limited distance. The tapered end of the aligning pin enters the bore I 4 of the body to ride against an inclined face or cam 23 formed in the adjusting shaft I5, the purpose of which is to bring about sliding movement of the aligning pin I in the opening I8 by endwise movement of the adjusting shaft I5 in the bore of the body.

The adjusting shaft extends a limited distance beyond one end of the body and is provided with a washer 24 held thereon by a -cotter key 25. The washer 24 forms a seat for one end of an expansion coil spring 2B, the other endof the spring bearing against one end of the body. The spring normally acts to position the shaft I5 so that the cam 23 will extend the aligning pin IS to its fullest extent outwardly of the body II from one side .of the body. `A manual movement of the shaft I5 in one direction with respect to the body will position the cam 23 so that the aligning pin I8 may move fully `within the openbody which will permit a wrist pin to be readily slid over the body and with the opening thereof brought into alignment with the opening I8. On freeing the shaft I5 the spring acts to drive the aligning pin through the opening of the Wrist pin. Y`

The adjusting shaft I5 is provided with a flattened face 21 to be engaged by a set screw 28 carried by the body II for the purpose of preventing the shaft I5 from rotating in the bore I4 of the body but which will permit the shaft to slide relativeto the body.

After a Wrist pin of a conventional construction has been adapted to the body III as before described, the tool may then be used to insert the Wrist pin through the bearings of thepiston and connecting rod and by turning the,` body ed onto the sleeve 29. It is to be understood that this tool may be provided with several sleeves constructed similar to the sleeve 29 except having external diameters of different sizes which consequently permits the use of the present invention with Wrist pins ranging in different sizes as to their external and internal diameters.

It is believed that the foregoing description, when taken in connection with the drawings will fully set forth the construction and advantages of this invention to those skilled in the art to which such a device relates, so that further dethrough the use of a Wrench if ynecessary the aligning pin I9 may be brought opposite tothe opening I of one of the bearings of the piston so that on alignment the pin I9 will enter the opening I of the piston properly aligning the opening of the Wrist pin withsaid opening I so that a lock bolt may be threaded into the oper ing I and extend into the opening of the Wrist pin. As the bolt is threaded into the opening 1 of the piston and the Wrist pin the shaft l5 's moved endWise manually so that the aligning pin may slide under the influence of the set bolt and thereby be moved out of the openings of the piston and `vvrist pin. With the shaft thus held in the manually operative position the body may be Withdrawn from the wrist pin thereby completing the `iob of applying the Wrist pin and locking thereof into the pis-ton.v

As shown in Figure 2 and also in Figure 6; a l

tailed description will not be required.

Having thus described the invention, what I claim is:

In a device of the character described, an elonnicating with said opening, a centering pin operating in the opening, vmeans for limiting the sliding movement of the centering pin andV adapted to permit passing thereof'throughanv opening of a Wrist pin into a lock boltVA opening of a piston, a shaft slidable in the bore, a cam on said shaft to coact with the pin for impart# ing movement thereto by the sliding movement of the shaft, a spring acting on the shaft to imv part movement thereto in one direction for 'the purpose of positioning the carn to extendVv the centering pin, and means for restraining the shaft against rotation in the bore permitting said shaft to slide in theA bore, said centering pin having one end beveled to coact with thecam' of the shaft, and asleeve adaptable to the vbodyV and' having an opening to align with the oper1` ing of the body to permit the centering pin to extend therethrough and Vtojperrnit thev bodyto be adapted to a Wrist pin of a larger size.

JACK ,i 

